Recursively examine JSON object in Python

Question

I've got a number of JSON files of different structures that all have a number of levels of "nesting". I need to examine certain keys that can appear anywhere in the object and update these.

Am struggling to handle the "nested" elements

I've got some code that have cobbled together from much Googling (am new to Python) and have tried both instance(value,dict) and type(value) is dict

However in no cases has the log showed "iterating deeper".

def iterate(dictionary):
    for key, value in dictionary.items():
        print('key {} -> value {}'.format(key, value))
        #if logic to update specific values
            print('Dict new value {}'.format(value))
        if isinstance(value, dict):
        #if type(value) is dict:
            print('Iterating deeper. Key {}'.format(key))
            dictionary[key] = iterate(value)
    return(dictionary)

Simple JSON example:

myObj = {
  "name":"John",
  "age":30,
  "cars": {
    "car1":"Ford",
    "car2":"BMW",
    "car3":"Fiat"
  }
 }

I'd expect to see "Iterating deeper. Key cars" printed out

yes- sorry- maybe not clear there- have removed the "if" logic for the specific use case (is commented) — LPD
– LPD, Commented Sep 1, 2019 at 8:28

awakenedhaki · Accepted Answer · 2019-09-01 11:36:24Z

To update:

def iterjson(data):
    for key, value in data.items():
        if (update_condition):
            data[key] = new_value

        print('key {} -> value {}'.format(key, value))
        if isinstance(value, dict):
            print('Iterating deeper. Key {}'.format(key))
            yield from iterjson(value)
        else:
            yield value

To iterate without updating:

def iterjson(data):
    for key, value in data.items():
        print('key {} -> value {}'.format(key, value))
        if isinstance(value, dict):
            print('Iterating deeper. Key {}'.format(key))
            yield from iterjson(value)
        else:
            yield value

If you want to iterate with list as well:

def iterjson(data):
    for key, value in data.items():
        print('key {} -> value {}'.format(key, value))
        if isinstance(value, dict):
            print('Iterating deeper. Key {}'.format(key))
            yield from iterjson(value)
        elif isinstance(value, list):
            for i in value:
                yield i
        else:
            yield value

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